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the final and arguably most risky aspect of the mission, the re entry and landing. when you send a spacecraft from the moon back to the earth that hits the atmosphere at about 25,000 mph and you have to lose speed before you get into the atmosphere because if you don t you can burn up on re entry and your spacecraft disintegrates and that is not good for any humans on board. the spacecraft has systems and it is designed to slow it down as it comes through the atmosphere and it is a heat shield to protect the spacecraft which has to stand up to temperature is about 3000 celsius and the parachutes have to open correctly and that has to come down at the slow enough velocity that that land safe in the ocean and although systems will be tested later this afternoon. i have heard it described like throwing a football about 300 yards and hitting a penny. is it really is complicated is that, it sounds terrifying. it is, you have to be really accurate. it is a very small window you have

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